8. 8. Which statement is correct according to the

8. 8. Which statement is correct according to the independent variables’ coefficients? (Points : 1.5) A) At the same weight, a green diamond is $1214.66 cheaper than diamonds in other colors. B) At the same weight, an orange diamond is $122.70 more expensive than diamonds in other colors. C) At the same weight, an aqua diamond is $741.14 more expensive than diamonds in other colors. D) At the same weight, an aqua diamond is $741.14 cheaper than a yellow diamond. Question 9.9. 9. Which statement is correct according to the data report given by R? (Points : 1.5) A) At the same weight, yellow diamonds are the most expensive ones among the four colors. B) At the same weight, green diamonds are the most expensive ones among the four colors. C) At the same weight, yellow diamonds are the cheapest ones among the four colors. D) At the same weight, prices from the highest to the lowest are Green>Aqua>Yellow>Orange Question 10.10. 10. Which statement about the F-test is correct? (Points : 1.5) A) The p-value of the F-test is greater than 0.05 in this case. B) According to the report, the analyst can conclude that either carats or colors, or both of the two factors can determine the diamond’s prices in the population. C) The analyst failed to reject the null hypothesis of the F-test. D) Neither carats nor colors would influence the diamond’s prices in the population. Question 11.11. 11. Which statement is correct? (Points : 1.5) A) Suppose the level of significance is set at 0.05, “carats” is a significant independent variable. B) Suppose the level of significance is set at 0.01, “color.Green” is a non-significant independent variable. C) “color.Orange” is not significant at the 5% level. D) “color.Aqua” is not significant at the 1% level.

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